G - Physics – 11 – B
Patent
G - Physics
11
B
352/32.2, 352/32
G11B 5/60 (2006.01) G11B 7/08 (2006.01)
Patent
CA 1066412
ABSTRACT The present invention relates to the steering of a light beam with an articulated and fixed mirror pair to the surface of a video disc. Prior art attempts to adjust the reading beam involved in the coarse manipulation of the light source to direct it to the video disc surface. The present invention provides an improved apparatus and method for steering the light beam. In accordance with the invention, an optical system having a source for producing a reading beam of radiation is pro- vided. The beam follows an optical path to the surface of the video disc. A pair of mirrors disposed in the optical path are arranged in opposing spaced relation to one another to cause the reading beam to be reflected at least once from each of the mirrors. At least one of the mirrors is articulated to steer the reading beam to a precisely selected location on the surface of the video disc. The mirrors may be planar and have their respective planar reflecting surfaces lying in parallel planes and at an angle to the reading beam. The articulated mirror can be arranged to steer the reading beam radially and/or circumferentially of the video disc.
280070
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